<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts'

require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    }
  },
  data() {
    return {
      chart: null
    }
  },
  mounted() {
    this.initChart()
    this.__resizeHandler = debounce(() => {
      if (this.chart) {
        this.chart.resize()
      }
    }, 100)
    window.addEventListener('resize', this.__resizeHandler)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    window.removeEventListener('resize', this.__resizeHandler)
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      const data = [
        [
          [28604, 77, 17096869, 'Australia', 1990],
          [31163, 77.4, 27662440, 'Canada', 1990],
          [1516, 68, 1154605773, 'China', 1990],
          [13670, 74.7, 10582082, 'Cuba', 1990],
          [28599, 75, 4986705, 'Finland', 1990],
          [29476, 77.1, 56943299, 'France', 1990],
          [31476, 75.4, 78958237, 'Germany', 1990],
          [28666, 78.1, 254830, 'Iceland', 1990],
          [1777, 57.7, 870601776, 'India', 1990],
          [29550, 79.1, 122249285, 'Japan', 1990],
          [2076, 67.9, 20194354, 'North Korea', 1990],
          [12087, 72, 42972254, 'South Korea', 1990],
          [24021, 75.4, 3397534, 'New Zealand', 1990],
          [43296, 76.8, 4240375, 'Norway', 1990],
          [10088, 70.8, 38195258, 'Poland', 1990],
          [19349, 69.6, 147568552, 'Russia', 1990],
          [10670, 67.3, 53994605, 'Turkey', 1990],
          [26424, 75.7, 57110117, 'United Kingdom', 1990],
          [37062, 75.4, 252847810, 'United States', 1990]
        ],
        [
          [44056, 81.8, 23968973, 'Australia', 2015],
          [43294, 81.7, 35939927, 'Canada', 2015],
          [13334, 76.9, 1376048943, 'China', 2015],
          [21291, 78.5, 11389562, 'Cuba', 2015],
          [38923, 80.8, 5503457, 'Finland', 2015],
          [37599, 81.9, 64395345, 'France', 2015],
          [44053, 81.1, 80688545, 'Germany', 2015],
          [42182, 82.8, 329425, 'Iceland', 2015],
          [5903, 66.8, 1311050527, 'India', 2015],
          [36162, 83.5, 126573481, 'Japan', 2015],
          [1390, 71.4, 25155317, 'North Korea', 2015],
          [34644, 80.7, 50293439, 'South Korea', 2015],
          [34186, 80.6, 4528526, 'New Zealand', 2015],
          [64304, 81.6, 5210967, 'Norway', 2015],
          [24787, 77.3, 38611794, 'Poland', 2015],
          [23038, 73.13, 143456918, 'Russia', 2015],
          [19360, 76.5, 78665830, 'Turkey', 2015],
          [38225, 81.4, 64715810, 'United Kingdom', 2015],
          [53354, 79.1, 321773631, 'United States', 2015]
        ]
      ]
      this.chart.setOption({
        title: {
          text: '1990 与 2015 年各国家人均寿命与 GDP'
        },
        legend: {
          right: 10,
          data: ['1990', '2015']
        },
        xAxis: {
          splitLine: {
            lineStyle: {
              type: 'dashed'
            }
          }
        },
        yAxis: {
          splitLine: {
            lineStyle: {
              type: 'dashed'
            }
          },
          scale: true
        },
        series: [
          {
            name: '1990',
            data: data[0],
            type: 'scatter',
            symbolSize: function(data) {
              return Math.sqrt(data[2]) / 5e2
            },
            label: {
              emphasis: {
                show: true,
                formatter: function(param) {
                  return param.data[3]
                },
                position: 'top'
              }
            },
            itemStyle: {
              normal: {
                shadowBlur: 10,
                shadowColor: 'rgba(120, 36, 50, 0.5)',
                shadowOffsetY: 5,
                color: new echarts.graphic.RadialGradient(0.4, 0.3, 1, [
                  {
                    offset: 0,
                    color: 'rgb(251, 118, 123)'
                  },
                  {
                    offset: 1,
                    color: 'rgb(204, 46, 72)'
                  }
                ])
              }
            }
          },
          {
            name: '2015',
            data: data[1],
            type: 'scatter',
            symbolSize: function(data) {
              return Math.sqrt(data[2]) / 5e2
            },
            label: {
              emphasis: {
                show: true,
                formatter: function(param) {
                  return param.data[3]
                },
                position: 'top'
              }
            },
            itemStyle: {
              normal: {
                shadowBlur: 10,
                shadowColor: 'rgba(25, 100, 150, 0.5)',
                shadowOffsetY: 5,
                color: new echarts.graphic.RadialGradient(0.4, 0.3, 1, [
                  {
                    offset: 0,
                    color: 'rgb(129, 227, 238)'
                  },
                  {
                    offset: 1,
                    color: 'rgb(25, 183, 207)'
                  }
                ])
              }
            }
          }
        ]
      })
    }
  }
}
</script>
